Question

Botany

What the thickness and structure of parenchyma, collenchyma, and sclerenchyma cells?

Answer 1

Parenchyma cells are isodiametric and thin walled. The cells can be oval, circular or poly­gonal with intercellular spaces. They are the living cells.

Collenchyma cells are longer than parenchyma cell. They are living. The intercellular spaces are absent. The intercellular spaces at the corner of cells become thick, and made of cellulose and pectin. This structure provides the cell wall rigidity. These cells are normally found as 3-4 layered hypodermis of herbaceous dicotyledonous stem.

Sclerenchyma cells possess the thickened secondary walls which may or may not be lignified. They are of various shapes and sizes when mature. They are dead.